STATISTICS F/BUSINESS+ECONOMICS-TEXT
13th Edition
ISBN: 9781305881884
Author: Anderson
Publisher: CENGAGE L
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Chapter 11.2, Problem 17E
Most individuals are aware of the fact that the average annual repair cost for an automobile depends on the age of the automobile. A researcher is interested in finding out whether the variance of the annual repair costs also increases with the age of the automobile. A sample of 26 automobiles 4 years old showed a sample standard deviation for annual repair costs of $170 and a sample of 25 automobiles 2 years old showed a sample standard deviation for annual repair costs of $100.
- a. State the null and alternative versions of the research hypothesis that the variance in annual repair costs is larger for the older automobiles.
- b. At a .01 level of significance, what is your conclusion? What is the p-value? Discuss the reasonableness of your findings.
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Chapter 11 Solutions
STATISTICS F/BUSINESS+ECONOMICS-TEXT
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